Malicious PDF — malware analysis report

Static analysis result for SHA-256 187192c5bc1a910c…

MALICIOUS

PDF

96.7 KB Created: 2021-07-30 06:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2db2f9936ae7bd111a8261ed5eef64c9 SHA-1: 1714666baf2e89de85fdb632fe1bfca9981402dc SHA-256: 187192c5bc1a910c14d731efbae75de8ff3c7ce52d7d8ada2d94013414a5af7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://prograsifkalip.com/files/tasadevokuko.pdf In PDF document text
    • https://africanresearchcenter.com/userfiles/file/purigogem.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/miguxokusojiwagilipe.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e27dd2d077c9547e3f41467df999f4b7/dafobedodewawegudogomo.pdfIn PDF document text
    • https://nadamasristorante.it/file/97386546887.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/43885088792.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/gozixoputekufokigulisip.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/tasojexanamibefari.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/75415913737.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kitajokojasojisobuveroxi.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///58704047039.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/27745743386.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e093d01d---vubefabijogifetidekixeb.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7606094f132e95dece2ddfda2c4983c1/fijifuf.pdfIn PDF document text
    • https://activepymes.com/pub/file/89011564089.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14724987140.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/92905311727.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0835ee2b6---zedupiferixugomajo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46b733a28---vutiwizevilova.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/26181171214.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fad9a55b---52515866671.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/42f4abf2320b3fb399e40c3bd0ca55f6/84040010302.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/46464767292.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b449349e03f---3462294541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=basic+adjectives+worksheet+pdf+for+beginnersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 11420 bytes
SHA-256: fff881c64dd04fb06f650985bf25477d62e019a8706a16bae6be8d341c45b0f0
font_02_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 17896 bytes
SHA-256: a29a054dc429350c7ce9f4b387fecbfa3a74900a208b0e7b29b7d6f6cab28700

Open this report in the interactive analyzer, or submit your own file for analysis.